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A manufacturer makes conical funnels for professional painters.

The funnels are formed from plastic with an 8-inch diameter base and a height of 9 inches.
After the cones cool, a machine cuts off 1 inch of the tip to leave a 1-inch diameter hole in the end.
What is the volume of the funnel after the tip is cut off?

1 Answer

3 votes

Answer: The volume of the cone after the tip is cut off equals 150 cubic inches

Step-by-step explanation: The dimensions of the cone formed from the funnel are given as height equals 9 inches and, radius equals 4 inches (radius = 8/2).

The volume of a cone is determined as follows;

Volume = πr²h/3

Volume = π x 4² x (9/3)

Volume = π x 16 x 3

Volume = 48π

When a portion of the cone is cut off from the tip, the height from the cut off part is 1 inch and the radius is 0.5 inch (radius = 1/2).

The volume of the cut off portion can now be calculated as;

Volume = πr²h/3

Volume = π x 0.5² x (3/3)

Volume = π x 0.25 x 1

Volume = 0.25π

Hence the volume of the cone after the tip has been cut off is now derived as follows;

Volume = 48π - 0.25π

Volume = 47.75π

Volume = 47.75 x 3.14

Volume = 149.935

Volume ≈ 150 cubic inches (Rounded to the nearest whole number)

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